I have setup a login/logout script in PERL. Once a user is authenticated, he/she is given options based on their login. Upon logout, they get re-directed to the login page. My dilemma is that the users can use the "back" button on their browser and continue to edit/view, etc. upon logout. I want the users to login again instead of using the "back" key. What is the easiest way to implement this? Would cookies do the job? If so, how do I setup/delete cookies using PERL?